How did the meningitis outbreak now spreading across the U.S. start?

The outbreak of fungal meningitis, which infected more than 100 people and killed eight as of Monday, was linked to a contaminated steroid solution manufactured by New England Compounding Center Inc. of Massachusetts. The company shipped 17,676 vials of the solution to 75 clinics in 23 states, which means there are potentially thousands of people who received a spinal injection of the pain-relieving solution.